user- ITiCSE '03: Proceedings of the 8th annual conference on Innovation and technology in computer science education, 35, page 173--177. New York, NY, USA, ACM Press, (September 2003)
- ITiCSE '04: Proceedings of the 9th annual SIGCSE conference on Innovation and technology in computer science education, 36, page 132--136. New York, NY, USA, ACM Press, (September 2004)
- Stanford, CA, USA, (1997)
- CHI '02: Proceedings of the SIGCHI conference on Human factors in computing systems, page 89--96. New York, NY, USA, ACM Press, (2002)
- DL '97: Proceedings of the second ACM international conference on Digital libraries, page 131--140. New York, NY, USA, ACM Press, (1997)
- JCDL '04: Proceedings of the 4th ACM/IEEE-CS joint conference on Digital libraries, page 349--357. New York, NY, USA, ACM Press, (2004)
- Int. J. Hum.-Comput. Stud. 59(3):257--285 (September 2003)
- CHI '01: Proceedings of the SIGCHI conference on Human factors in computing systems, page 285--292. New York, NY, USA, ACM Press, (2001)
- Int. J. Hum.-Comput. Stud. 50(4):329--362 (April 1999)
- AVI '04: Proceedings of the working conference on Advanced visual interfaces, page 98--102. New York, NY, USA, ACM Press, (2004)
- DL '00: Proceedings of the fifth ACM conference on Digital libraries, page 19--26. New York, NY, USA, ACM Press, (2000)
- IUI '04: Proceedings of the 9th international conference on Intelligent user interface, page 191--197. New York, NY, USA, ACM Press, (2004)
- HYPERTEXT '03: Proceedings of the fourteenth ACM conference on Hypertext and hypermedia, page 120--121. New York, NY, USA, ACM Press, (2003)
- JCDL '05: Proceedings of the 5th ACM/IEEE-CS joint conference on Digital libraries, page 235--243. New York, NY, USA, ACM Press, (2005)
- CHI '02: CHI '02 extended abstracts on Human factors in computing systems, page 812--813. New York, NY, USA, ACM Press, (2002)
- CHI '03: Proceedings of the SIGCHI conference on Human factors in computing systems, page 385--393. New York, NY, USA, ACM Press, (2003)
- CHI '98: Proceedings of the SIGCHI conference on Human factors in computing systems, page 456--463. New York, NY, USA, ACM Press/Addison-Wesley Publishing Co., (1998)
- WWW '02: Proceedings of the 11th international conference on World Wide Web, page 160--171. New York, NY, USA, ACM Press, (2002)
- HYPERTEXT '01: Proceedings of the twelfth ACM conference on Hypertext and Hypermedia, page 9--18. New York, NY, USA, ACM Press, (2001)
- Proceedings of the 10th International World Wide Web Conference, page 623--632. (2001)
